package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

/**
 * 用户登录功能
 */
public class LoginUserDemo {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("请输入用户名:");
        String userName = scan.next();
        System.out.println("请输入密码:");
        String password = scan.next();
        try (Connection connection = DBUtil.getConnection();){
            Statement statement = connection.createStatement();
            String sql = "SELECT username, password, nickname, age " +
                         "FROM userinfo " +
                         "WHERE username = '"+userName+"' " +
                         "  AND password = '"+password+"' ";
            //System.out.println(sql);
            ResultSet rs = statement.executeQuery(sql);
            if (rs.next()){
                String nickname = rs.getString("nickname");
                System.out.println("登录成功!欢迎[" + nickname + "]回来");
            }else {
                System.out.println("登录失败!用户名或密码错误");
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
